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Juniper JN0-351 Exam Overview:

Certification Vendor:	Juniper Networks
Exam Name:	Enterprise Routing and Switching, Specialist (JNCIS-ENT)
Exam Number:	JN0-351
Related Certifications:	JNCIS-ENT
Passing Score:	Not specified (Pass/Fail status available immediately)
Available Languages:	English
Certificate Validity Period:	3 years
Exam Price:	$300 USD
Exam Duration:	90 minutes
Real Exam Qty:	65
Exam Format:	Multiple-choice questions
Sample Questions:	Juniper JN0-351 Sample Questions
Exam Way:	Pearson VUE testing centers (In-person)
Pre Condition:	Recommended: JNCIA-Junos certification
Official Syllabus URL:	https://www.juniper.net/us/en/training/certification/tracks/enterprise-routing-switching/jncis-ent.html

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Juniper JN0-351 Exam Syllabus Topics:

Topic	Details
Topic 1	Spanning Tree: Networking professionals explore the principles and advantages of the Spanning Tree Protocol (STP) to ensure loop-free topologies in Layer 2 networks.
Topic 2	BGP: This topic focuses on the operational and conceptual elements of BGP, a cornerstone in enterprise networks.
Topic 3	IS-IS: Aspiring Juniper networking professionals enhance their understanding of IS-IS routing protocols. This topic equips candidates with the knowledge to configure and monitor IS-IS systems, addressing specific exam challenges and practical applications.
Topic 4	Tunnels: The fundamentals of IP tunneling are emphasized, highlighting their requirements and functionalities. Mastery in configuring, monitoring, and troubleshooting tunnels equips professionals to meet the demands of the JN0-351 Exam.
Topic 5	Layer 2 Security: This topic introduces Layer 2 protection mechanisms and firewall filters to fortify network security. Practical skills in configuring, monitoring, and troubleshooting these features prepare candidates to address exam objectives and real-world challenges effectively.

Juniper Enterprise Routing and Switching, Specialist (JNCIS-ENT) Sample Questions (Q142-Q147):

NEW QUESTION # 142
In a LAN segment, which tie-breaker would spanning tree consider if equal-cost paths exist between two or more switches to the root bridge?

A. port ID
B. port priority
C. bridge ID
D. interface number

Answer: B

NEW QUESTION # 143
You are troubleshooting an issue where traffic to 192.168.10.0/24 is being sent to R1 instead of your desired path through R2.
Referring to the exhibit, what is the reason for the problem?

A. R2's route is not the best path due to loop prevention.
B. R2's route is not the best path due to a lower origin code.
C. R1's route is the best path due to a higher local preference
D. R1's route is the best path due to the shorter AS path.

Answer: C

Explanation:
The exhibit shows the output of the command show ip bgp, which displays information about the BGP routes in the routing table. The output shows two routes for the destination 192.168.10.0/24, one from R1 and one from R2.
The route from R1 has a local preference of 200, while the route from R2 has a local preference of 100. Local preference is a BGP attribute that indicates the degree of preference for a route within an autonomous system (AS). A higher local preference means a more preferred route.
BGP uses a best path selection algorithm to choose the best route for each destination among multiple paths. The algorithm compares different attributes of the routes in a specific order of precedence. The first attribute that is compared is weight, which is a Cisco-specific attribute that is local to the router. If the weight is equal or not set, the next attribute that is compared is local preference.
In this case, both routes have the same weight of 0, which means that they are learned from external BGP (eBGP) peers. Therefore, the next attribute that is compared is local preference.
Since R1's route has a higher local preference than R2's route, it is chosen as the best path and installed in the routing table. The other attributes, such as origin code and AS path, are not considered in this case.

NEW QUESTION # 144
Which two statements about DHCP snooping are correct? (Choose two.)

A. By default, the Junos OS treats access ports as trusted and trunk ports as untrusted.
B. DHCP snooping uses ARP to add statically defined IP addresses to its database.
C. DHCP snooping inspects all DHCP packets on untrusted ports.
D. The DHCP database maps IP addresses, MAC addresses, and the associated VLAN.

Answer: C,D

NEW QUESTION # 145
You are troubleshooting a BGP routing issue between your network and a customer router and are reviewing the BGP routing policies. Which two statements are correct in this scenario? (Choose two.)

A. Export policies are applied after the RIB-Local table.
B. Export policies are applied to routes in the RIB-ln table.
C. Import policies are applied to routes in the RIB-Local table.
D. Import policies are applied after the RIB-ln table.

Answer: A,D

Explanation:
Explanation
In BGP, routing policies are used to control the flow of routing information between BGP peers1.
Option C suggests that import policies are applied after the RIB-In table. This is correct because import policies in BGP are applied to routes that are received from a BGP peer, before they are installed in the local BGP Routing Information Base (RIB-In)1. The RIB-In is a database that stores all the routes that are received from all peers1.
Option D suggests that export policies are applied after the RIB-Local table. This is correct because export policies in BGP are applied to routes that are being advertised to a BGP peer, after they have been selected from the local BGP Routing Information Base (RIB-Local)1. The RIB-Local is a database that stores all the routes that the local router is using1.
Therefore, options C and D are correct.

NEW QUESTION # 146
You are a network operator who wants to add a second ISP connection and remove the default route to the existing ISP You decide to deploy the BGP protocol in the network.
What two statements are correct in this scenario? (Choose two.)

A. IBGP peers advertise routes received from IBGP peers to other IBGP peers.
B. IBGP peers advertise routes received from EBGP peers to other IBGP peers.
C. IBGP updates the next-hop attribute to ensure reachability within an AS.
D. EBGP peers advertise routes received from IBGP peers to other EBGP peers.

Answer: B,C

Explanation:
A is correct because IBGP updates the next-hop attribute to ensure reachability within an AS. This is because the next-hop attribute is the IP address of the router that advertises the route to a BGP peer. If the next-hop attribute is not changed by IBGP, it would be the IP address of an external router, which may not be reachable by all routers within the AS. Therefore, IBGP updates the next-hop attribute to the IP address of the router that received the route from an EBGP peer1.
B is correct because IBGP peers advertise routes received from EBGP peers to other IBGP peers. This is because BGP follows the rule of advertising only the best route to a destination, and EBGP routes have a higher preference than IBGP routes. Therefore, IBGP peers advertise routes learned from an EBGP peer to all BGP peers, including both EBGP and IBGP peers1.

NEW QUESTION # 147
......

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